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ABC's fall primetime lineup

'20/20,' with anchors Chris Cuomo and Elizabeth Vargas, returns to ABC on Sept. 16, 2011 and will air on Fridays between 10 and 11 p.m.  In the premiere episode, a teen who helped plan her mother's murder breaks her silence in an exclusive interview. <span class=meta>(ABC News)</span>
September 16, 2011 6:40:43 PM PDT